In the new Red Bull Media House and Poor Boyz Productions film Tracing Skylines Karl Fostvedt takes urban skiing to a whole new level by spending his time searching for the perfect jib, drops and jumps amidst the concrete jungle that is Detroit. Here is a behind the scenes look at what the crew had to go through to make it a reality. Watch the full segment in the film Tracing Skylines, available on iTunes and as a 3-in-1 Collector's Edition DVD, Blu-Ray and Digital Download.